title: Strong light-matter interaction in systems described by a modified Dirac equation.
abstract: The bulk states of some materials, such as topological insulators, are described by a modified Dirac equation. Such systems may have trivial and non-trivial phases. In this article, we show that in the non-trivial phase a strong light-matter interaction exists in a two-dimensional system, which leads to an optical conductivity at least one order of magnitude larger than that of graphene.
authors.affiliation: Physics Department and CFUM, University of Minho, P-4710-057, Braga, Portugal. peres@fisica.uminho.pt
authors.forename: N M R
authors.initials: NM
authors.lastname: Peres
authors.forename: Jaime E
authors.initials: JE
authors.lastname: Santos